“Oswald having been killed today after our warnings to the Dallas Police Department was inexcusable,” Hoover dictated. “It will allow, I am afraid, a lot of civil rights people to raise a lot of hell because he was handcuffed and had no weapon. There are bound to be some elements of our society who will holler their heads off that his civil rights were violated — which they were.”
Source: JFK Files: J. Edgar Hoover Said Public Must Believe Lee Harvey Oswald Acted Alone – NBC News